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9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 OR LGPL-2.1) |
2 | * | |
886d51a3 | 3 | * wrapper/irqdesc.c |
c337ddc2 MD |
4 | * |
5 | * wrapper around irq_to_desc. Using KALLSYMS to get its address when | |
6 | * available, else we need to have a kernel that exports this function to GPL | |
7 | * modules. | |
8 | * | |
886d51a3 | 9 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
c337ddc2 MD |
10 | */ |
11 | ||
12 | #ifdef CONFIG_KALLSYMS | |
13 | ||
14 | #include <linux/kallsyms.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/irqnr.h> | |
5a2f5e92 MD |
17 | #include <wrapper/kallsyms.h> |
18 | #include <wrapper/irqdesc.h> | |
c337ddc2 MD |
19 | |
20 | static | |
21 | struct irq_desc *(*irq_to_desc_sym)(unsigned int irq); | |
22 | ||
23 | struct irq_desc *wrapper_irq_to_desc(unsigned int irq) | |
24 | { | |
25 | if (!irq_to_desc_sym) | |
26 | irq_to_desc_sym = (void *) kallsyms_lookup_funcptr("irq_to_desc"); | |
27 | if (irq_to_desc_sym) { | |
28 | return irq_to_desc_sym(irq); | |
29 | } else { | |
e36de50d | 30 | printk_once(KERN_WARNING "LTTng: irq_to_desc symbol lookup failed.\n"); |
c337ddc2 MD |
31 | return NULL; |
32 | } | |
33 | } | |
34 | ||
35 | #else | |
36 | ||
37 | #include <linux/interrupt.h> | |
38 | #include <linux/irqnr.h> | |
39 | ||
40 | struct irq_desc *wrapper_irq_to_desc(unsigned int irq) | |
41 | { | |
42 | return irq_to_desc(irq); | |
43 | } | |
44 | ||
45 | #endif |